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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae3e9f2ebe90c53ad22db0b0c28044b6bf196172082e5c8a6f6dbec9cbe4958' 
  AND token = 'n/pEc14/dwI+XazGk8PLFVSOWAqraQQ+hj8XPc8Idqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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