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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35114aa3b2af6d873b6726087ef65a2c97566b4cff3cf017e53af0bcd1d3ec5' 
  AND token = '16y0DS3sn3in6nWwPq03JGBAhdidrXjKxOiPcnHe2cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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