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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7694c36a897bc9e0c40c22a8ecab66f40f0e511d9398d5a572cb953134c2786' 
  AND token = 'I4x41mXX9qZX57RQMLvoxrR55N2snncEJL1ZPMu/Ybc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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