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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26738a0a80cb9f3ad5b82e97f8c92d0960d9f8c142ee2aeb5410d9ac686540db' 
  AND token = 'UE7njDjJ8JhmE9r3+1O1O27LVVqVvS7oB+yZG23sy1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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