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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aafb32cf4e89396815d36b80eb6c54b921bb3db4921d8727e20adb09494caa9' 
  AND token = 'GjoiYe/IuTnN61VPyB0QuskYAmWCl01vvLrzI2n9h54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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