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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0004035cf630212dc46db9ced791afb3a54ca209927f1c2fce5ce7325eb9dd34' 
  AND token = 'kehV5vTVaiieDYOg4664c5TeBHoTK3Zfud+I23PhP4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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