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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddfd5ba00c96a58a03927b2f8ef0902954f38336f4ff2882a2f3ea254350468' 
  AND token = '96hKMyJk49IEZDhJfJIAK6r6mvIbf1a1DcHT8QS5KX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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