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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e896c9a0771b3b917b7ff3032706f7555c46eb7604567c13fd17fbe45b5d62' 
  AND token = 'IAT84zp/NCVbhSfbMdJ+api/e6VKkGCHqtDj8D6ub3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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