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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4119d510d590106c5af7be21954ca8ec8fd033aaa6357bf5f38f157616e26d39' 
  AND token = 'bH7fFqK5MbxoGnqbaM2HI/rjtVva61mJE9XJkoXD/rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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