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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd84d08fdd14ed419a834ac058dc4f26f392f601809431be6b7e6e6a0b9a202e' 
  AND token = 'lWd+KHoHW3cuSD4AvsI1m4oApsV0krB+25dgBhrwFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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