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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1567484b56103d0af1bcf41e5424e1b83a608202f87929d72e2a4d268a558f3' 
  AND token = 'a15BDqUsuA5t5mSh/rtqujEm/fDztE3Qih/fblbHGb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}