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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d724eff22ae9fe6f6fea54437035b9042f6f3584497aa08c662f8a64f028cbc' 
  AND token = 'yh4b4f2xdgQ13Q/QYewIT6CLst7Ntkjaaq3493pRQIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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