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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71dac948215ff4298b25337c149394a872b4d86184767e88da18d5b700fbb0d' 
  AND token = 'qjmxSDZ2PC6yeaqnVh0RWnxnjzNFi3d8NuLqNQM4dY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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