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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a7ce409a45099c2ef3286ce7b17b3e9df4cd347d302dd9b7cdc5502071fc4a' 
  AND token = '5qL9reSBVfBA1odVr1pDfEoylpJ6JywkNFZL9CqvgIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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