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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccc045b054b317f9f67fd325b997ed7b818ede1fccf92d037419993972c087f' 
  AND token = 'W+pE69rl7aTQm5psGeS9tqEaghAg47Q+kh4WRxVHRrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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