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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8708fe645d5958ba9375d07b482fc0bc4090e6998f2e10c7eb9a4e6449d2411a' 
  AND token = 'PN4W+1gkPAaktubCPBZQbECc2O5aNDvgsq0c1OgQktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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