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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2363c9f321f12af2754a9ef0a75480ea84e9fcce2b089d190051625b10f75c' 
  AND token = 'kbcuMl2FW1l0NQZzC2fFQN9XGacOtT3QYblWPICoZZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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