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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099678813cff6b9cdb98f979ed6e0a1648b8a689f83a5911d9135d19756008e0' 
  AND token = 'XneidCyF76YlvHps2Bly+aOJrBjHLrakKT2KnK3Zi98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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