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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5708aa26e3f06f9cbf11669a626ac31e75d3d63ca7fa3ef242018a98adec1d' 
  AND token = 'Qbjzy2JfVxoeoPhTb+rwYT0hCvHKEq0FK00K5xcKzF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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