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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd97dbb8544ceb558bd0ba508de5485362ff6eb110f88b1094af7250afcd5e4d' 
  AND token = '6GwS1YD08k+U1IaLV9VLZR3mv0tprF4mc70LMlsgpqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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