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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a14233cf53083e74a1743c438f624d026a5ae8a2e2d250dc7752b6bc30732c9' 
  AND token = 'zGM3M/IgXH91LrdNyREx+wJFV2CGQxQ9kpIwU6/yxcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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