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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71f6d3ae6cc192a5250c6b5d527672db1f4b20c49cc43213162b1dcb83768d' 
  AND token = 'b9BmH0yiU5yuioHHWe9opQ3+Qh7l/2zQs3YLAuGlSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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