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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9685b04915d496206c8a256d192f41d83c5ad81c0b8e7835741eb44eb7e9774' 
  AND token = 'dvUV++yVSMW5qJKan5vEq45ahyvqOvDANqQRaSfGswE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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