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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b093c51a37e96f7c082ff49c31b23d9d6c1439927c6bf7b45b1e46b072b09651' 
  AND token = 'bKCK1zSmmOynJAY2iCjlK14glnCuqCl8RFyWKDUKhts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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