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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237bdf22f126a400b4df105506237a77919d0d9d4d0cdd4cb83dc4e64661cc9c' 
  AND token = 'iDJnfz38hEqQeslt8yJO52imw2ErqQvnGsT4H5uxGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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