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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94f29c1cf2e2efd07d19ab8bddba1b18e8d042e915f9b0261e536b51e09ee20' 
  AND token = '1dqpBsOowwW1DVViBzUvyrU4CTPa9hjecfykqSzC4gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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