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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4701c4c60ac368ee0068f177540244fdcfaf07605d6f1cac21f443dba22a6911' 
  AND token = 'J0wiYW7HpgL8je5GVpvkRVli5ppLT2Zl1bP4HDs3KRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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