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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e02ea9331ddee87b5fc5d6aa689c8eac2867c9bb540fc3453805cacefc1ad41' 
  AND token = 'yEd2D82yxcslJqgJi9JAiRG9rEo7hz4nRDdhZAhsA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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