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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4871d841cd46e55b1f05faf84e3c18076c0056ebf90178b2599f41e6d55d5b' 
  AND token = 'UUWvOwMK4kCto7IiwHQxQA6P4i2cpPDIS7T2LuGIWZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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