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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bdcea28e08070e83705dca7e79df1bdcbaea9e9802fe17c0eaca09a6dca19a' 
  AND token = 'CuqKGDF2mMNMnB4NWq832y5bFpLqpYMy0OU0oRHTXzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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