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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c6ad2a542f95b6d58f3aa1868ff590d67e9ee70a903cfcd6d6b987a8e97257' 
  AND token = 'o1F6kikt/q1zT4/ziVyl9vXJu4pJqyvjJl+EH8gasEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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