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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624180a523db9b69106133f8837b46f361101a0c01d8d127b9f2a6ced2bc8f76' 
  AND token = '2rufe9sGRgrUb3InolScwZiSq+Tl+Bj3J71c4YGr4p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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