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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4780e628a66a50257310bb2a8c3fb395917b8c21dd6f51b49002398be8e39c1' 
  AND token = 'J5qsbbMyppWhXqf8vVxnCXujDmQrWktAWbF2VUW+ES4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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