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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe5c12e9b900db87edacfec6fca89d9cbf2ba39d4dc5e41245bac7b027a3bb0' 
  AND token = 'riK0o77Yi0BBix8l5PIltUtBddxOTak9mrFs6ozGgw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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