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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45ab237c8a5c3e86f0bd5ef6ba409fd9b66c3f25f1553b5989ad82aa28e52ca' 
  AND token = 'kRvk0cAf/Job6103zZb7T/wsM0ckqdwf8eyPTgvuO4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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