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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675318ca7149de58064b555f7e08bc28c1df64612a05ec5411b68d3b514cf9e1' 
  AND token = '8t91AQNiWiSFpL6D+C32shx9pma5j9p5AiAq/DkE5qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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