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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663eeeb48aba6f47b71652546c6d5781bc3ef58c902a0a7efc4d2e86112f39df' 
  AND token = '7haCk3PDq6rrvHYAXSIOHF7GPHAVMrGPTPKHg0XnIr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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