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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704b58b91e6baa05bfa5bda025782f895767cc15e8dac9c684b0fb3360f1f785' 
  AND token = 'amLN62EZCfrm7waVUtCzHZUJ3W4+5R/l11SU9HgXaGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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