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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a980b5340228f8f92c71b5cfb23a5429b08215257eed712dab86fb818963105a' 
  AND token = 'VRSsAfF4//DrafIoY32dWa3FahjbB4M1Op2tWRCMz5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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