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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8edd8f2fa6c61ed09d91c57166a0221ab449a2dc2d2980e498150529fdd58f1' 
  AND token = 'p2wYfcfHIo90twioAwqTvwuV17JwTp5AxhBbs5SHu58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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