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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3acca5721c8e74ab3fb9c0350b0adee3ac01786f04fc17424abbde7f730cee' 
  AND token = '5HZUFhbDyyGBZn3cT8NHzfGF4yNdkAT7woaADwwAmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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