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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b0f667aacd2f6170b2b08c76b61c324777f5454541602344d79e6fafbd20a5' 
  AND token = 'x+CioXWRlwxH9myWfUoDuAhKpBqNXZKhNOAIQet7iGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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