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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb8ca8ef49be2130528bc86f4e36c145b9ced5844bde7c6db292a39bcb814ff' 
  AND token = 'H6/LTjJTfO99OC1QhrskyIVi6lq8gBvt/ubfvGBFblg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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