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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00258b186255b599d6ce2578ec4a4b52334448a2287abc685a530d66ff725ceb' 
  AND token = 'zhj80o03pplkKwAGSRkz5GNozCD/rhJ08sWWNcsuD7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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