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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874750be72f972a9b8fc4247437c2467db7622deb24be145cb875af54ed35c5b' 
  AND token = 'LeawGY3o/zhUuvZj74zkU1FcvrGN/Q2mY/eLiQH5Gls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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