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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6762ed786ec9bd01807726fbeca60d71c2f6688d9be611116ed4106b68eedec' 
  AND token = 'h/6b7aT435EdIaiH+uHTLmMTovN2xETiGUtVpE1MmW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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