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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef28b98470b29d24110cb72205b8766343b190fe47cf06e5251dfe4a5148c4a3' 
  AND token = 'QSnrrzI0TZ/WQeUonxItDJzr9TXwpea0vmIq45JKjLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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