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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6ca414900249e53fffb42f7ba92209a85d0d3605e50777365d5f88d5ed4887' 
  AND token = 'zMd4KfTheTjkXtKqwPA7rxIdGY8wJoZ3JJ40iIlbjKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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