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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d02168cee00461658ba86d9c8e8e6be3bc6540dc36b604d8701f5e0fb269e4' 
  AND token = 'hRF9qArfracBewDN4uV823nx6TPiEdENovsEO5+QteQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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