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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8d725705a96da4b438a7f4a279d47f1ce1accaa950774389659af332ff046a' 
  AND token = 'dnnAOj0L+WJPPUnsaOwOHfxo0O7TrKZdKTXm8ci4jXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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