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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5248d39978db76c6c1bf9a07e62b988ae53b6e03a9c676d803f2ec41f77ff93f' 
  AND token = 'eqS22oWqkbPSQo3TKW8gx82kjt3dUnR+UCHANAjsqI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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