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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c378c5b033b13eb7f1167052f6d2da63c84ab56f9cfc8a3849ae58b02eacef72' 
  AND token = 'aH3NcHjYM9cJPNSPqA/W92Z84Ku8Mcue8ThWScnNUPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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