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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7a235ee8acd5952e0af7aa7c1d872da186ebd529504e7c2647609611ebc00b' 
  AND token = 'DR9TwXWfTV3fAj5mAeBoTIOXpQNAH8U6soLZWgpSi7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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