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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf281c6872025ac3df8a3784ce7f05dd641ae586365e935a0f2bdfdc6b54501' 
  AND token = 'DoRM+pKVOcUH72h+7G7DEoP9OabHfxyLfZD2KBbE7iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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