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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f55497427ec5cd690c84d86a799afcf9c27b57a59e30063e028be6e2c85118' 
  AND token = '8YqrlAyDPJx8wxiWPiSq9DMs5JLZ0j32ZBt/xuHLHH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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